I need to send bulk mails but not that high. After sending some mails around 20 - 30 I got this and mail sending stoped. Not sure if below logs are related but sending mail once in 20 ~30 mails mails sending stops and after a while continous. Mar 14 23:43:22 mail postfix/anvil[6784]: statistics: max connection rate 1/60s for (smtp:::1) at Mar 14 23:40:02 Mar 14 23:43:22 mail postfix/anvil[6784]: statistics: max connection count 1 for (smtp:::1) at Mar 14 23:40:02 Mar 14 23:43:22 mail postfix/anvil[6784]: statistics: max cache size 1 at Mar 14 23:40:02 Which limits must be edited to avoid mail sending suspend and send faster mails?